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Finding the Fourth Proportional to 28,656.88, 42,968.06 and 12,859

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Solution

The fourth proportional to 28,656.88, 42,968.06 and 12,859 is: 19,280.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,656.88 : 42,968.06 = 12,859 : x
  2. Step 2: Convert to fraction form
    28,656.88/42,968.06 = 12,859/x
  3. Step 3: Cross multiply
    28,656.88x = 42,968.06 × 12,859
  4. Step 4: Simplify right side
    28,656.88x = 552,526,283.54
  5. Step 5: Solve for x
    x = 552,526,283.54/28,656.88
  6. Step 6: Final answer
    x = 19,280.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.